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| # 一律先把需要的 lib 都加入
require "nokogiri"
class Post ActiveRecord::Base
# 先把需要的 module 都加入
include Techbang::Goodies
# 宣告 class accessor、類別變數、常數
cattr_reader :per_page
@@per_page = 10
DEFAULT_AUTHOR = "you"
# 宣告 instance accessor、序列化的資料欄位、可以存取的欄位
attr_reader :headline_image
serialize :exif
attr_accessible :title, :excerpt, :description
# 宣告各式 validation 和 validation filter
validates_presence_of :title, :published_at
before_validation :ensure_title
# 宣告 has_many、belongs_to、has_and_belongs_to_many 等 association 關係
belongs_to :user, :counter_cache => true
has_many :comments, :as => :resource
# 如果有 delegate 則寫在那個 association 下
has_one :profile
accepts_nested_attributes_for :profile
delegate :resume, :blog_url, :facebook_url, :plurk_url, :twitter_url, :to => :profile
# 宣告 gem 的 class method，通常我會把這個 gem 相關的 method 放一起
has_attached_file :image
validates_attachment_content_type :image
validates_attachment_size :image
after_image_post_process :get_exif
delegate :url, :to => :image
acts_as_taggable_on :tags
chinese_permalink :title
define_index do
indexes title
indexes description
end
# 宣告各式 filter/callback
before_save :build_profile, :if => "profile.nil?"
after_save :save_profile
# 宣告各式 scope 定義
scope :recent, lambda { |amount| order(""published_at DESC"").limit(amount || 5) }
# 宣告 class method
def self.published(post_types=[self.to_s])
where(:type => post_types).where(:aasm_state => "published").where(["published_at = ?", Time.zone.now]).order("published_at DESC")
end
# 宣告 instance method
def is_published?
aasm_state == "published" published_at = Time.zone.now
end
protected
# ....
private
# ....
end
|